What does a 1" change in dia. cause to wot rpm? I've found a set of spares that have 19" instead of 20". Thank you for any help
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Capt. Ron.
"I will not tiptoe through life to arrive safely at death"
"Never Trade Luck For Skill"
1987 3870 - Northern Lights ll
Hino EH700
Westerbeke 8.0
1999 Logic Marine 17' CC/50 Merc.
on Louisiana pool Mississippi River. -
A lot of factors are involved here: number of blades, shape of blades, diameter, pitch, cup, aluminum, stainless, bronze -so there will be many variations that will affect WOT.capt. ron wrote:
What does a 1" change in dia. cause to wot rpm? I've found a set of spares that have 19" instead of 20". Thank you for any help
In general terms: the bigger the prop (either diameter, pitch, or cup) the lower the WOT rpm. The smaller the prop (either diameter, pitch, or no cup) the higher the WOT rpm.
Assuming your existing prop is correctly matched to your boat configuration, then if the spare 19" diameter prop has the same or lesser pitch than the existing prop, then the spare prop should result in an increase in WOT rpm. If the spare prop has a greater pitch than the existing prop, then you might not notice any change in WOT rpm or maybe even a decrease in WOT rpm.
Two C's 1990 3888 MY, 175 Hinos, Hurth 630 Trannys
Past Commodore Emerald Rose Yacht Club
Member International Order of the Blue Gavel
MMSI: 338030604
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